For those that didn't know the part number for the LQ4 and the LQ9 Rods are the same so there is no differance in strength. That is at least for 2005.

 

i believe 05 they switched to ls2 rods in all LQX motors

 

which are superior/stronger? (ie boosted applications)
ls2
pre 05 lq4
pre 05 lq9

 

in order of connecting rod strength:
LS2
pre-'05 LQ9
pre-'05 LQ4

however the lq4 has lower compression so is therefore able to run a little more boost but thats another point

 

pre '05 lq9 is stronger than lq4
ls2? good question.
http://www.automotiverebuilder.com/ar/eb040538.htm

I couldn't get link to work so try copy & paste.

 

only problem is the ls2 wasnt used in the comparo in that write-up

i believe the ls2 had stronger rods in them than the LQ9 - 95% sure ( see moregrip's thread on his blower, shortblock, etc. install)

 

So if the 2005 LQ4 and LQ9 rods are the same. What are they strenght wise comepared to in previous years?

 

stronger than the pre-05 LQx rods

 

The pre 05's are strong, look to see what guys have put them threw, 500+ hp at the crank and 6500+ rpms on a regular basis, without issue, so that means that the new engines 05+ you can really beat the hell out of them

JOHN

 

Great to know, now when I do a 6.0l swap in my truck I'll get a used 05+ engine from the salavge yard!